*'''''LBOsheet2:''''' Second sheet of Brian's data; used to construct gvkey-to-dealnumb link
*'''''yearsbygvkeys:''''' Composite primary key (all years 1970 to 2015 cross-producted with unique gvkeys); all other data is joined onto this
*'''''gvkeyxdealnumbfinal:''''' Final gvkey to dealnumb lookup table. Includes results of name-based matching.
*'''''yearsbygvkeysfilled2:''''' Compustat dataset with LBO events flagged
==Construction of Dataset (SQL)==